I've been in sort of a quiet mode lately, but I am paying attention, and at least a couple of times today I've found myself staring at this inlay design for minutes on end.
I gather that you (Derrick) get overall credit for the concept, and I've seen a couple things recently suggesting that Mike does really nice work, but I've got to believe that the key here is a good dose of Susan magic.
I look at this and see a dancing couple, perhaps in the style of Fred Astaire/Ginger Rogers(?), not that I'm really a fan of such, but there is somehow a similar grace, fluidity, balance of contrasts, and of course the very clever bass clef used as the D.
I think it is absolutely perfect, and wouldn't change a thing. Makes me wish I had more interesting initials.
-Bob (RFN)